The 20-year-old star admits she has considered having her body art removed by laser but has decided not to worry too much about them until she is much older.

She said: ''I've thought about it before because, you know, when I get older I don't know if I want to have rock and roll on my middle finger.

''I'm young and I can rock it now and when I get older I can worry about it later.''

Speaking of one inking, a Tattoo of her friend's lips on her wrist, she added: ''It was just a spur of the moment, stupid decision.''

In late 2010, the US 'x factor' judge checked into rehab to be treated for an eating disorder and self-harm issues and she admits it was a ''relief'' to be diagnosed with bipolar disorder as it meant she wasn't ''crazy''.

Speaking on 'Live! With Kelly and Michael', she said: ''I was like, 'Oh my gosh, that means I'm not really crazy, there's a reason.'

''And it was just so awesome to be able to pinpoint a diagnosis for the reasons why I was extremely happy and in, like, a euphoric state, and the next month I was in, like, a deep depression.

''I had everything great in my life I had nothing to complain about but I wasn't happy.''

Demi's admission to rehab came after she punched one of her backing dancers and she admits she was in a very ''dark'' place when the incident occurred.

She said: ''I got into a situation in a different country when I actually ended up hitting one of my friends. I was just going through something so dark and I was very, very mentally sick.

''So, you know, when I ended after leaving the tour my parents had planned an intervention.''